GB2385211A

GB2385211A - Location of power terminals in a DC motor

Info

Publication number: GB2385211A
Application number: GB0203274A
Authority: GB
Inventors: Alex Horng; Tso-Kuo Yin
Original assignee: Sunonwealth Electric Machine Industry Co Ltd
Current assignee: Sunonwealth Electric Machine Industry Co Ltd
Priority date: 2002-02-12
Filing date: 2002-02-12
Publication date: 2003-08-13
Anticipated expiration: 2022-02-12
Also published as: GB0203274D0; GB2385211B

Abstract

The outer wall of the motor housing (10, 40) is provided with a power plate (2, 50) which is provided with connection terminals (22, 52). The housing wall may include an insertion groove 17,46 to accept the power plate. A connection circuit 21 may have a first end formed with a respective connection terminal (22), and a second end electrically connected to an drive circuit that may control the motor to start and rotate. Alternatively the power plate 50 is formed as a protrusion of a printed circuit carrying printed windings 51.

Description

1 ELECTRIC POWER CONNECTION STRUCTURE OF A DIRECT

2 CURRENT MOTOR

3 Background of the Invention

4 1. Field of the Invention

5 The present invention relates to an electric power connection 6 structure of a direct current motor, and more particularly to an electric power 7 connection structure of a direct current motor, wherein the connection circuit 8 of the electric power may be positioned conveniently, and cannot be torn out.

9 2. Description of the Related Art

to A first conventional heatsink fan 90 having a direct current motor in 11 accordance with the prior art shown in Fig. 6 comprised power cord 92 which

2 is connected to a stator coil 91, reeved through a frame 93 of a housing and a 3 baffle 94, and is then drawn out. Thus, the frame 93 and the baffle 94 may 4 absorb the external pulling force to the power cord 92 outside of the frame 93, IS thereby preventing the power cord 92 from being pulled to detach from the 6 stator coil 91.

7 A second conventional heatsink fan 80 in accordance with the prior 8 art shown in Figs. 7 and 8 comprises a power cord 82 which is connected to a l 9 stator coil 81, is pressed by a press rod 84 of a cover plate 83, is reeved through So the wall 85 of a housing, and is then drawn out. Thus, the press rod 84 and the 2 wall 85 of the housing may absorb the external pulling force to the power cord 22 82 outside of the housing of the heatsink fan 80, thereby preventing the power 23 cord 82 from being pulled to detach from the stator coil 81.

24 In the above mentioned conventional heatsink fan which uses a 2s direct current motor, the connection design of the power cord mainly uses tiny 26 cords that are protruded outward from the frame to connect the electric power.

27 Thus, the frame 93 and the baffle 94 or the press rod 84 and the wall 85 of the

1 housing may absorb the external pulling force on the power cord, thereby preventing the power cord from being pulled to detach from the stator coil.

3 However, the conventional heatsink fan using a direct current motor has to 4 prevent the power cord from being pulled to detach Mom the stator coil, so that 5 the fabrication of the conventional heatsink fan is inconvenient. In addition, 6 the electric cords are protruded outward from the frame to connect the electric 7 power, thereby decreasing the aesthetic quality of the conventional heatsink 8 fan.

9 Summary of the Invention

lo The primary objective of the present invention is to provide an 1 electric power connection structure of a direct current- motor, wherein the 2 electric power connection structure may be processed and manufactured 3 conveniently, and the connection circuit of the electric power may be 4 positioned conveniently, and cannot be torn out.

s In accordance with the present invention, there is provided an electric 16 power connection structure of a direct current motor, wherein the outer wall of 17 the motor housing is provided with a power plate which is provided with 8 connection terminals and connection circuits. The connection circuit has a first 19 end formed with a connection terminal that may be connected to an electric JO power for driving the motor to rotate, and a second end electrically connected 21 to an drive circuit that may control the motor to start and rotate.

22 Further benefits and advantages of the present invention will become 23 apparent after a careful reading of the detailed description with appropriate

24 reference to the accompanying drawings.

2s Brief Description of the Drawings

26 Fig. 1 is an exploded perspective view in accordance with a first 27 embodiment of the present invention;

1 Fig. 2 is a perspective assembly view in accordance with the first 2 embodiment of the present invention; 3 Fig. 3 is a cross-sectional view taken along line 3-3 as shown in Fig. 4 2; s Fig. 4 is an exploded perspective view in accordance with a second 6 embodiment of the present invention; Fig. 5 is a perspective assembly view in accordance with the second 8 embodiment of the present invention; 9 Fig. 6 is a crosssectional assembly view of a first conventional 10 motor in accordance with the prior art;

i 1 Fig. 7 is a top plan assembly view of a second.conventional motor in 12 accordance with the prior art; and

13 Fig. 8 is a cross-sectional view taken along line 8-8 as shown in Fig. 14 7. 15 Detailed Description of the Preferred Embodiments

16 Referring to the drawings and initially to Fig. 1, a direct current 17 motor 1 in accordance with a first embodiment of the present invention 18 comprises a housing 10 having a bottom board 11 provided with a shaft seat 12 9 combined with a shaft tube 14 of a stator 13. A rotor 15 has a rotation shaft 16 20 rotatably mounted in the shaft tube 14. The housing 10 has an outer wall 21 provided with a power plate 2. The power plate 2 includes connection circuits 22 21. The connection circuit 2 1 has a first end formed with a connection terminal 23 22 that may be connected to the electric power, and a second end electrically 24 connected to a circuit board 131 (see Fig. 3) that has an drive circuit. In the 2s preferred embodiment, the power plate 2 and the circuit board 131 of the 26 present invention may be formed by the same film printed circuit. In addition, 27 the outer wall of the housing 10 may be provided with an insertion groove 17

1 so that the power plate 2 may be inserted into and positioned in the insertion groove 17. If necessary, the bottom board 11 of the housing 10 has an annular 3 wall 111 which is provided with a cutout 112 for passage of the connection 4 circuit21.

5 Referring to Figs. 2 and 3, the direct current motor 1 in accordance 6 with the first embodiment of the present invention is assembled. The circuit 7 board 131 of the motor 1 is connected with the connection circuit 21 of the 8 power plate 2 which is passed through the cutout 112 of the bottom board 11 of 9 the housing 10. The power plate 2 may be inserted into and positioned in the lo insertion groove 17 ofthe housing 10. The connection terminal 22 ofthe power 1 plate 2 may be connected to the electric power. Thus; the circuit board 131 12 having an drive circuit may be electrically connected to the connection circuit 13 21 of the power plate 2, and power plate 2 may be inserted into and positioned 4 in the insertion groove 17 of the housing 10. Thus, the motor 1 does not have 15 electric cords that are protruded outward from the housing 10, and does not 6 have electric cords that are detached due to a pulling force.

17 Referring to Fig. 4, a direct current motor 4 in accordance with a 18 second embodiment of the present invention comprises a housing 40 provided 19 with a shaft seat 41. A rotor 42 has a rotation shaft 43 having a first end 20 rotatably mounted in the shaft seat 41, and a second end pivoted on a cover 21 plate 44. The wall of the housing has an annular groove 45 for receiving a film 22 printed circuit 5. The film printed circuit 5 is protruded with a power plate 50, 23 and is provided with multiple coils 51 and a sensing drive member (not shown).

24 The power plate 50 is provided with connection terminals 52 that may be Is connected to the electric power. The power plate 50 is protruded outward from 26 the annular groove 45, and is bent and bonded on the outer wall of the housing 27 40. In the preferred embodiment, the outer wall of the housing 40 may be

1 provided with an insertion groove 46 so that the power plate SO may be 2 inserted into and positioned in the insertion groove 46.

3 Referring to Fig. S. the direct current motor in accordance with the second embodiment of the present invention is assembled. The film printed 5 circuit S is mounted in the annular groove 45 of the housing 40, and the power 6 plate SO is inserted into and positioned in the insertion groove 46 of the 7 housing 40, and the connection terminal 52 of the power plate 50 may be 8 connected to the electric power. Thus, the motor 4 does not have electric cords 9 that are protruded outward from the housing 40, and does not have electric lo cords that are detached due to a pulling force.

Accordingly, the direct current motor or the,heatsink fan using the 2 direct current motor does not have electric cords that are protruded outward 3 from the housing, and does not have electric cords that are detached due to a 4 pulling force. Thus, the poor quality of fabrication of the direct current motor 5 may be reduced, and the outer appearance of the direct current motor may be 6 simpler and more beautiful. In addition, the direct current motor or the heatsink 7 fan is convenient in use and storage.

8 Although the invention has been explained in relation to its preferred 19 embodiment as mentioned above, it is to be understood that many other 20 possible modifications and variations can be made without departing from the 21 scope of the present invention. It is, therefore, contemplated that the appended 22 claim or claims will cover such modifications and variations that fall within the 23 true scope of the invention.

s

Claims

What is Claimed is: 21. An electric power connection structure of a direct current motor, 3 comprising: 4a housing 10, having a bottom board 11 provided with a shaft seat 12 5 combined with a stator 13 and a circuit board 131 provided with a drive circuit, 6a rotor 15 having a rotation shaft 16 rotatably mounted in a shaft tube 14 of the 7 stator 13, the housing 10 at least having an outer wall; and 8a power plate 2 having connection circuits 21, the connection circuit 9 21 having a first end formed with a connection terminal 22 that may be lo connected to an electric power, and a second end electrically connected to an 11 drive circuit of the circuit board 131, and the power plate 2 mounted on the 12 outer wall of the housing 10. 32. The electric power connection structure of a direct current motor 14 as claimed in claim 1, wherein the circuit board 131 provided with a drive 15 circuit and the power plate 2 may be formed by a film printed circuit. 63. The electric power connection structure of a direct current motor 7 as claimed in claim 1, wherein the outer wall of the housing 10 is provided with is an insertion groove 17 so that the power plate 2 may be inserted into and 19 positioned in the insertion groove 17. 204. The electric power connection structure of a direct current motor 2i as claimed in claim 1, wherein the bottom board 11 of the housing 10 has an 22annular wall 111 which is provided with a cutout 112 for passage of the 23 connection circuit 21. 245. An electric power connection structure of a direct current motor, 2s compr smg: it: 1a housing 40, having a shaft seat 41, a rotor 42 having a rotation shaft 243 having one end rotatably mounted in the shaft seat 41, the housing 40 at 3least having an outer wall; and 4a film printed circuit 5, provided with multiple coils S 1 and a sensing 5drive member, the film printed circuit 5 protruded with a power plate SO which 6is provided with connection terminals 52 that may be connected to an electric 7power, and the power plate 50 mounted on the outer wall of the housing 40. 86. The electric power connection structure of a direct current motor gas claimed in claim 5, wherein the housing 40 has an annular groove 45 for l oreceiving and positioning the film printed circuit S. 7. The electric power connection structure of a direct current motor 2as claimed in claim 5, wherein the outer wall ofthe housing 40 is provided with 3an insertion groove 46 so that the power plate 50 of the film printed circuit 5 4may be inserted into and positioned in the insertion groove 46. Amendments to the claims have been filed as follows CLAIMS

1. An electric power connection structure of a rmniature brushless do motor applied to an electronic device for heat dissipation, composing: 5 a housing (10) having a bottom board (11) provided with a shaD seat (12) combined with a stator (13) and a circuit board (131) provided with a drive circuit, a rotor (15) having a rotation shaft (16) rotatably mounted in a shah tube (14) of the stator (13), the housing (10) at least having an outer wall that defines an inner space adapted to accommodate the rotor (15), the inner 10 space is further provided with an air inlet and an air outlet; and a power plate (2) having connection circuits (21), the connection circuit (21) having a first end fonned with a connection terminal (22) that may be connected to an electric power, and a second end electrically connected to a drive circuit of the circuit board (131), and the power plate (2) extended 15 beyond the inner space and mounted on the outer wall of the housing (10) so as to avoid obstruction and to speed up assembling operation.

2. The electric power connection structure of a direct current motor as claimed in claim 1, wherein the circuit board (131) provided with a drive 20 circuit and the power plate (2) may be formed by a film panted circuit.

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3. - The electric power connection structure of a direct curtest motor as claimed in claim 1, wherein the outer wall of the housing (10) is provided with an insertion groove (17) so that the power plate (2) may be inserted into 25 and positioned in the insertion groove (17)...CLME:

4. The electric power connection structure of a direct current motor as claimed in claun 1, wherein the bottom board (11) of &e housing (10) has an annular wall (111) which is provided with a cutout (112) for passage ofthe 30 connection circuit (21).

5. An electric power connection structure of a miniature brushless do motor applied to an electronic device for heat dissipation, comprising: a housing (40), having a shad seat (41), a rotor (42) having a rotation 5 shaft (43) having one end rotatably mounted in the shaft seat (41), the housing (40) at last having an outer wall that defines an inner space adapted to accommodate the rotor (42), the inner space is farther provided with an air inlet and an air outlet; and a film printed circuit (5), provided with multiple coils (51) and a sensing 10 drive member, the film printed circuit (S) protruded with a power plate (50) which is prodded with connection terminals (52) that may be connected to an electric power, and the power plate (SO) extended beyond the inner space and mounted on the outer wall of the housing (40) so as to avoid obstruction and to speed up assembling operation.

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